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Range finder for still or moving picture cameras

  • US 4,304,487 A
  • Filed: 11/29/1979
  • Issued: 12/08/1981
  • Est. Priority Date: 12/14/1978
  • Status: Expired due to Term
First Claim
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1. Apparatus for measuring the distance between a receiving location and a selected object, comprising,means (14-17) for transmitting a light beam having a straight limiting edge (27) on one side thereof to said selected object, thereby creating an illuminating region on said object, said object diffusely reflecting light back from said illuminated region toward said transmitting location;

  • at said receiving location;

    optical means (22) positioned to receive at least part of said reflected light for creating an image of said illuminated region including said straight limiting edge, the position of said image relative to said optical means being indicative of said distance to said selected object;

    detector means (23) movable relative to said optical means for furnishing a stop signal when in a final position indicative of the position of said straight limiting edge relative to said optical means; and

    means (26) for moving said detector means relative to said optical means until receipt of said stop signal, whereby said final position of said detector means relative to said optical means constitutes a measure of said distance between said receiving location and said selected object.

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